You're right, of course. In fact, the specs call for a unit to fall within a certain range of masses as I recall. Density then affects the volumn.
But my point had to do with a 20 year old student's comprehension of a pint and a quart versus her comprehension of a liter. The blood was there merely to get the conversation started. By the way, I took the opportunity in class to point out that a puddle covering a square meter at a depth of 1 mm contains a liter. THAT got everyone's attention and even the instructor counted out the floor tiles to get a feel for that. A depth of 1 mm is probably not too bad an estimate of the depth of a pool of blood on a tile floor, I would think. Jim On Wednesday, 2003 October 22 13:22, Terry Simpson wrote: > James R. Frysinger wrote: > >he mentioned a "unit of blood" stating that it was roughly a pint or half > > of a quart. > > The amount in a unit is very variable because of how it is collected. > > See the sizes of bags come in rational metric sizes, at least for the > following supplier (I suspect that they all do): > www.baxterfenwal.com/jsp/products/wholeBloodFamily.jsp > > "a unit of blood (about 400 to 500 ml" > http://clinicalstudies.info.nih.gov/detail/A_1999-CC-0168.html > > "one unit of blood (450-500 ml)" > www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=113 >1 1689&dopt=Abstract > > "unit of donated blood (450 mL)" > www.cdc.gov/ncidod/eid/vol8no8/02-0025.htm > > > > There is a difference between units collected and units delivered (because > treatments reduce the volume). > http://blood-bank.egypt.com/professionals.html -- James R. Frysinger Lifetime Certified Advanced Metrication Specialist Senior Member, IEEE http://www.cofc.edu/~frysingj [EMAIL PROTECTED] [EMAIL PROTECTED] Office: Physics Lab Manager, Lecturer Dept. of Physics and Astronomy University/College of Charleston 66 George Street Charleston, SC 29424 843.953.7644 (phone) 843.953.4824 (FAX) Home: 10 Captiva Row Charleston, SC 29407 843.225.0805
